The study of open star clusters is important to understand star formation
process in the Galaxy. A precise knowledge of cluster parameters such as
age, distance, chemical composition as well as stellar population distribution
and cluster mass function at the time of star formation play a key role in
understanding the star formation history. In this talk, I will present UBVRI
photometric study and Gaia DR2 kinematic study of open clusters NGC
381 and Trumpler 7. I will discuss membership determination of stars in
the clusters and estimation of the physical parameters like distance, age, and
reddening by using stellar isochrones tting method in the observed colour-
magnitude diagram and two-colour diagram. I will also discuss derivation
of luminosity functions and mass functions for both the clusters.